LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Schedule of Liability for Future Policy Benefits, Revenue and Interest Accretion (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	$ 158	$ 104
Interest Accretion	84	68
Term
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	87	60
Interest Accretion	16	17
Payout - Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	59	27
Interest Accretion	39	21
Payout - Non-Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	9	15
Interest Accretion	10	10
Group Pension
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	0	0
Interest Accretion	5	5
Health
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	3	2
Interest Accretion	$ 14	$ 15